header {
    position: absolute;
    top: 0;
    width: 100%;
    line-height: 2.3rem;
    z-index: 2;
    background-color: #fff;
    font-size: 16px;
  }
  header .icon-back {
    color: #ee7c24;
  }
  header .title {
    position: absolute;
    width: 100%;
    line-height: 2.3rem;
    text-align: center;
  }